feat(cron): support name-based lookup for job operations

Cron mutation operations (run/pause/resume/remove) and 'hermes cron edit'
now accept a job name in addition to the hex ID, with case-insensitive
matching. Before this, 'hermes cron run my_job_name' died with
'Job with ID my_job_name not found' and forced the user to look up the
hex ID first.

The original PR matched by name but silently picked the first match when
two jobs shared a name. This version refuses to act on an ambiguous name
and surfaces every matching job (id, name, schedule, next_run_at) so the
caller can pick a specific ID.

- cron/jobs.py:
  - get_job() stays ID-only (preserves existing call-site semantics for
    web_server/api_server/curator/scheduler/test code that always passes
    real IDs).
  - resolve_job_ref() is the new name-or-ID resolver, used by pause/
    resume/trigger/remove_job. Exact ID match wins over a name match
    even if a different job's name happens to equal that ID. Ambiguous
    name match raises AmbiguousJobReference with all candidate IDs.
- tools/cronjob_tools.py: dispatch site uses resolve_job_ref, surfaces
  ambiguous matches as a structured error with the matching IDs.
- hermes_cli/cron.py: 'cron edit' uses resolve_job_ref so editing by
  name works and ambiguous names are reported with IDs.
- tests/cron/test_jobs.py: new TestResolveJobRef covering ID match,
  case-insensitive name match, ID-wins-over-name, ambiguous refusal,
  and that pause/resume/trigger/remove all refuse on ambiguity.

Closes #2627

hermes_cli/cron.py

@@ -196,9 +196,15 @@ def cron_create(args):
 
 
 def cron_edit(args):
-    from cron.jobs import get_job
+    from cron.jobs import AmbiguousJobReference, resolve_job_ref
 
-    job = get_job(args.job_id)
+    try:
+        job = resolve_job_ref(args.job_id)
+    except AmbiguousJobReference as exc:
+        print(color(str(exc), Colors.RED))
+        for m in exc.matches:
+            print(f"  {m['id']}  (name: {m.get('name')!r})")
+        return 1
     if not job:
         print(color(f"Job not found: {args.job_id}", Colors.RED))
         return 1